>1)      The fact RA4 is open-drain only when used as an output is not
>         mentioned on Page 11, whereas it is on, say the 16F876.
>
>         16F62x: Bi-directional I/O port/Can be configured as
>T0CKI/comparator output
>
>         16F87x: RA4 can also be the clock input to the Timer0 module.
>Output is open drain type.
>

OK, but that's pretty much a given with PICs.  RA4 = O/C.

>2)      RA6/OSC2/CLKOUT description says:
>
>         Bi-directional I/O port/Oscillator crystal output. Connects to
>crystal or resonator in crystal
>         oscillator mode. In ER mode, OSC2 pin outputs CLKOUT which has 1/4
>the frequency
>         of OSC1, and denotes the instruction cycle rate.
>
>         When this is actually optional behavior, so RA6 can be used for
>general
>         purpose I/O while using ER mode (there are two ER modes, with and
>         without clock/4 output on RA6).

It can also be that way for two IRC modes.

Thanks for clearing it up.  I thought it was something new.

Andy

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